tbeadwell



UNrrn rari-3s Aramv rma.

NV. B. TREADWELL, OF ALBANY, NEW YORK.

VGRATE AND @RATE-BARS.

To all whom it may concern:

Be it known that I', W. B. TREADWELL, of the city and county of Albany, and State of New York, have invented a new and Improved Grate for Cooking-Stoves, Ranges, and Furnaces; and I do hereby declare that the following isla full, clear, and exact description thereof, reference being had to the accompany' ing drawings, making a part of this specification, in which- Figure l is a top view of my improved grate applied to a tire-chamber. Fig. 2 is a longitudin al section taken in avertical plane through the center of the grate and nre-chamber, showing the hooked rod and lever for moving the grate. Fig. 3 is a transverse section through the grate and its nre-chamber. Fig. 4 is a similar View representing the grate in a position for discharging its contents into the ashbox.

Similar letters of reference indicate corresponding parts in the several figures. y

The object of my invention is to constructa grate in suchmanner that its bars shall all be susceptible of receiving a free vibrating or swinging movement of considerable extent, for the purpose of more thoroughly shaking the body of coals which lie upon them and separating the ashes therefrom, and effecting this object with'less expenditure ot' power than with grates hitherto constructed, as will be hereinafter described.

Another object of my invention is to so construct a grate the bars of which have a sidewise swinging movement that it can bc tilted orupset for the purpose of emptying it of its contents, as will be hereinafter described.

To enable others skilled in the art to understand lny invention, I will describe its construction and operation.

In the accompanying drawings, A represents an oblong rectangular frame, which is constructed with journals a a on its ends, for supporting this frame in suitable bearings in the side walls of the stove. One of thejournals a projects through the side walls orplate and is adapted to receive the squaresocket of a lever, A', which is used for oscillating or upsetting said frame when it is desired to empty the grate of its contents, as represented in Fig. 4.

B B represent a number of curved gratebars, which havejournals b b formed on their ends, which enter suitable bearings formed in the longitudinal vside bars of the frame A, as

clearly shown in Figs. 3 and 4. If desirable, the ends of the grate-bars may be supported upon strips which are suitably secured to the inside surfaces ofthe longitudinal bars of the frame A, so that when desired the grate-bars can all be removed and others substituted in their stead. -Oollectivel y the grate-bars B form a concave upper surface, and their sides are parallel to each other, and preserve this parallelism when they are moved by means' of a longitudinal connectin g-rod, K, which has pins S S projecting from its side, thatenter eyes that are formed on the lower or convex edges of the bars B. It' desirable, studs or pins may be formed on the lower edges of the grate-bars and enter perforations which can be made through the connectin g-rod K. By this means the grate-bars are all connected together at equal distances apart, and they can all be vibrated simultaneously by giving an endwise movement to the connecting-rod K, a hooked rod or shaker, A2, being used for this purpose, as shown in Fig. 2.

It will be seen from the above description that I considerably increase the grate surface laterally by curving the bars, and that I am enabled to give a swinging movement to these bars, the effect of which is to agitate the body of coals by alternately raising and lowering these coals, and at the same time stirring them and sit'ting the ashes between the bars. In ordinary grates, if a hard cinder wedges itself lbetween the bars, it is sometimes lvery dif'cult to move the grate. It is very laborious under any circumstances to move the ordinary grates, as so little leverage is afforded in the grate itself; but with my grate verylittle power will be required to shake or vibrate it, owing to the curved form ot' the bars.

In appl yin g my improved grates to re-cham bers of stoves or ranges, I desire to protect thejournals of the grate-bars as much as possible from the effects of intense heat, for which purpose I shall extend the back ends'of the said bars above the journals, as indicated in Fig. 3 in red lines,and the front ends of the pivoted bars will be protected by allowing the lining of the front part ot the tire-chamber to project over the front bar of the frame A.

This will not in any manner change the nature of my invention, nor interfere with the tilting or upsetting of the grate. If desirable,

the vibrating bars B may be applied to a framel which is stationary and not capable of bein g upset, as above described. Whether the frame-support for the gratebars be movable or rigidly fixed Within the stove or range, it Will not in any manner interfere With the operation of the grate-bars for separating the ashes from the coals. I prefer in all cases to have the supportingframe of the grate-bars so applied and arranged at the bottom of the fire-chamber that it can be oscilla-ted or upset at pleasure for deposit- -ing the contents of the grate into the ash-pit.

Having thus described my invention, What I claim as,l new, and desire to secure by Letters Patent, is-

1. So applying curved or centrally-depressed grate-bars B to' aixcdor movable frame, A, and connecting said bars together that they are susceptible of receiving a vibratin g motion about their axes, substantially as described.

2. The construction of curved grate-bars with journals on their extremities and projecting eyes, or their equivalents, for receiving a connecting-rod, K, substantially as described.

3. The combination of curved or depressed grate-bars B and a tilting frame, A, substantially as described.

W. B. TREADWELL.

`Witnesses:

G. W. PACKARD, RroHD. M. RAND. 

